Stool



FIG. 1 is a side top perspective view of a stool showing my new design;

FIG. 2 is a front view thereof; the opposite side being a mirror image thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a side front view thereof;

FIG. 5 is a side view thereof; the opposite side being a mirror image thereof; and,

FIG. 6 is a side bottom perspective view thereof. 

The ornamental design for a stool, as shown and described. 